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Standard Algorithms Videos 19 videos

AP Computer Science 2.1 Standard Algorithms
432 Views

APCS: Standard Algorithms Drill 2, Problem 1. How much slower is InefficientSum than EfficientSum in the best case for an array of n elements?

AP Computer Science 2.5 Standard Algorithms
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In this computer science drill question, figure out which implementation will copy one array over to another.

AP Computer Science 3.3 Standard Algorithms
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AP Computer Science: Standard Algorithms Drill 3, Problem 3. What should go in "expression 1" to satisfy the conditional statement?

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AP Computer Science 1.2 Standard Algorithms 172 Views


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AP Computer Science 1.2 Standard Algorithms. What is the output of Recurse(5)?


Transcript

00:00

Thank you We sneak here's your shmoop du jour featuring

00:05

a function called re curse Previously on lee used by

00:09

ancient mummies with all right Well what is the output

00:13

of re curse five i'm thinking we're thinking they're your

00:17

potential answers All right Uh thank And let's Go boy

00:23

don't be deceived This little recursive function looks simple but

00:26

noticed here that unless the imager an equal zero it's

00:29

going to do a little math on whatever imager was

00:31

given in call itself again And as long as n

00:35

is a non zero value this function will keep calling

00:38

itself over and over and over and over again You're

00:40

done If an equal zero return one All right That

00:45

peace is important It's the rikers in loops based case

00:49

The condition that must be met to put an end

00:51

to this madness No zero on then It's not over

00:55

Right Well when we finally do get into equal zero

00:58

the function will return a one The question asked us

01:02

to consider end to be five Well being that five

01:05

is not equal to zero We instead move allowed to

01:08

one plus two times recursive Five minutes to five minutes

01:12

To three So now we're going back over the function

01:14

with a three instead of a five Well guess what

01:17

three is also not equals Zero so we're looking at

01:20

one plus two times recursive three months two three minus

01:22

two is one and again top one is not zero

01:25

one plus two times recursive one minus two but one

01:28

minus two is negative one in california Anyway negative one

01:31

is not zero one plus two times workers of negative

01:34

one negative too well negative one minus two is negative

01:38

three and we can see where this is going on

01:41

a downward spiral that will never crawl out of because

01:44

we've skipped zero entirely and we'll never get in back

01:48

up to meet the bass case So the answer is 00:01:50.313 --> [endTime] e for ever Never never Oh

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